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Acquisitions - Summary of Acquisition and Integration Related Charges Incurred (Detail) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]    
Total acquisition and integration related charges $ 5.2 $ 3.3
AAG Acquisition [Member]    
Business Acquisition [Line Items]    
Total acquisition and integration related charges 0.2 1.3
HHI Business    
Business Acquisition [Line Items]    
Total acquisition and integration related charges 2.7 1.9
Petmatrix LLC [Member]    
Business Acquisition [Line Items]    
Total acquisition and integration related charges 1.6 0.0
GloFish [Member]    
Business Acquisition [Line Items]    
Total acquisition and integration related charges 0.4 0.0
Other    
Business Acquisition [Line Items]    
Total acquisition and integration related charges $ 0.3 $ 0.1